10. Since it you want to find how many 0.3s it would take to make 3, you would divide 3 by 0.3 or move the decimal over one spot to the right making it 10.
25. 29 minutes and 53 seconds
26. 6 gallons
11-5=6
18-11-7
26-18=8
........... so on and so forth.
I think you get the point.